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Late Holocene sedimentary environments of south San Francisco Bay, California, illustrated in gravity cores

October 10, 2014

Data are reported here from 51 gravity cores collected from the southern part of San Francisco Bay by the U.S. Geological Survey in 1990. The sedimentary record in the cores demonstrates a stable geographic distribution of facies and spans a few thousand years. Carbon-14 dating of the sediments suggests that sedimentation rates average about 1 mm/yr. The geometry of the bay floor and the character of the sediment deposited have remained about the same in the time spanned by the cores. However, the sedimentary record over periods of centuries or decades is likely to be much more variable. Sediments containing a few bivalve shells and bivalve or oyster coquinas are most often found west of the main channel and near the San Mateo Bridge. Elsewhere in the south bay, shells are rare except in the southernmost reaches where scattered gastropod shells are found.

Citation Information

Publication Year 2014
Title Late Holocene sedimentary environments of south San Francisco Bay, California, illustrated in gravity cores
DOI 10.3133/ofr20141198
Authors Donald L. Woodrow, Theresa A. Fregoso, Florence L. Wong, Bruce E. Jaffe
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 2014-1198
Index ID ofr20141198
Record Source USGS Publications Warehouse
USGS Organization Pacific Coastal and Marine Science Center